JPS59142765A - Driving device of cassette tape recorder - Google Patents

Abstract

PURPOSE:To switch operation state securely through economical and simple constitution with less electric power consumption performing all operations including cue and review operations through a gear coaxial with a flywheel. CONSTITUTION:When a slider 15 is elevated by the rotation of the 1st cam gear 5, a head chassis is linked to the slider 15 by a spring 30, a pinch roller support part 25 is linked by a spring 29, and the abutting part 27 of the pinch roller support part is in abutting relation with the head chassis 28, so the head chassis is elevated by them and a pinch roller 26 abuts on a capstan 11a, starting play operation. The flywheel coupled with a motor pulley 12 by a belt 36 rotates to rotate a pulley 20 coupled with the flywheel 11 by a belt 37, and its rotation is transmitted to a driving pulley 19 coaxial with the pulley 20 to rotate a take-up reel shaft 22 through an idler 18 which abuts thereupon, performing take-up operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive mechanism for a cassette tape recorder,
The conventional cassette recorder drive mechanism uses the rotation of the flywheel to perform all operations such as play, fast forward, rewind, key, and review, and improves operability. or play electrically using a planoja solenoid (P
It was used to perform actions corresponding to each operation such as fast forward (F, F), rewind (REW), etc.
Those that utilize the properties of the flywheel have complicated and large mechanisms, have many intervening levers, etc., and are not very easy to operate. Electrically driven devices perform all operations using a plunger, so they have drawbacks such as having to be driven with a large-capacity plunger, consuming large amounts of power, and making a loud operation sound.

In addition, when pausing (temporarily stopping), the pinch roller is usually moved in conjunction with the head chassis, so it is necessary to lower the head chassis and remove the pinch roller from the capstan. An inexpensive cassette tape recorder drive that improves operability, since the head separates from the magnetic tape at the same time, causing scratch noise at the moment the head separates from the tape. The present invention, which provides a mechanism, will be described in detail below based on an embodiment shown in the drawings.

FIG. 1 is a diagram showing the overall arrangement of the present invention, as seen from the mounting surface of the cassette, and the details of the cassette and other parts are omitted to simplify the diagram. In the figure, 1 is a pose,
A first plunger for fast forwarding, rewinding, keying, and reading 1 operations, which is connected to the lever 6 and swings the lever 6 about its rotation axis 60. . ′
Reference numeral 2 designates a second plunger for rewinding, which is connected to a flank change lever (hereinafter referred to as a C-lever) 8 and is swung around a rotating shaft 80 of the FC lever. Reference numeral 3 denotes a third granger for gray operation, which is connected to the lever 4 and swings the lever 4 about a rotation shaft 40. 5 is a first cam gear for performing operations such as play, and 7 is a second cam gear for performing operations such as pause, fast forward, rewind, key, and review. 9 is the function change slider (hereafter "
T:, l11C slider) determines each operation mode. 10 is a flywheel gear formed coaxially and integrally with the flywheel 11, and lla is the central axis of the flywheel and a capstan. 1
2 is a motor pulley, and 14 is a spring that biases the lever 4 counterclockwise in the figure. 15 is idler 1
8 is an idler slider 17 and an idler plate 16
19 is a drive pulley that is driven by a shaft provided by tracing the - in the negative direction. It is connected to the T-pulley 20 and rotates integrally with it. 21 is a drive gear provided integrally and coaxially with the drive pulley 19. 13 is a supply reel shaft and is a gear provided on the back side of the 7 langes 13a. 23 meshes with the drive gear. 22 is a take-up reel shaft, and 7 langes 22a engage the idler 1.
Gear 2 engaged with 8 and provided on the back side of 7 flange 22a
2b and meshes with the intermediate gear 24. Reference numeral 25 denotes a pinch roller support part, one end of which is rotatably supported by a shaft 250, and a pinch roller 26 rotatably supported near the other end. Further, the pinch roller support member 25 is provided with a contact portion 27 that contacts the cam of the second cam gear 7 and the head chassis 28, and a portion 27a of the contact portion 27 is connected to the surface of the mechanism by a shield (not shown). The back side of the paper has been eaten away. 29 is a spring tensioned between the slider 15 and the pinch roller support part 254j; 30 is a spring tensioned between the spatula 1 chassis 28 and the slider 15; 1 and 31 are positioning sliders;
Move laterally in relation to 9. The head base 32 is placed on the head chassis 28 and has a recording/reproducing head 33 and an erasing head 34.

Note that FIG. 1 is a diagram showing the playing state, and the front and back of each part is as follows: The recording/reproducing head 33, the erasing head 34, the pinch roller 26 of the capstan lla, and the two reels are located at the frontmost side where the cassette is installed. The shaft 13.22 etc. are located, then the spring 29.30 and idler 18, a part of the slider 15, and the flanges 13a, 22, a1 of each reel shaft.
A drive pulley is located, and a head chassis 28, an intermediate gear 24, a drive gear 21, gears 22b and 23 of each reel shaft, and an idler slider 17 are located slightly behind the drive pulley. The slider 15 and the front part of the positioning slider 31 are located on the back side of the head shear 728, and a part of the slider 15 and a part of the positioning slider 31 extend to the back side via the chassis 28. On the back side of the chassis 28, from the side closest to the chassis 28, the FC slider 9,
An eleventh second cam gear and the like are located, and a pulley 20, a flywheel 111, and a motor pulley 12 are located on the back side thereof, and a motor (not shown) is located further behind them via a subchassis (not shown).

Next, the operation will be explained based on each figure. FIG. 2 is a partially extracted front view for explaining the start from a stationary state of the mechanism. The lever 4 is biased clockwise in the figure by a spring 14, is pivotally supported by a rotation shaft 4o, and has one end connected to the third plunger 3.
The iron core 3a is connected to the iron core 3a. A cylindrical protrusion 4a is formed at the other end, and is inserted into a cam groove 5a provided on one side of the first cam gear 5. The first cam gear 5 has a gear 5b formed on its outer periphery, and a part thereof has two missing teeth 5c.
, 5d are provided, and a center protrusion 5e and a peripheral protrusion 5f are provided on one side surface, and both constitute a cam groove 5a. Further, a cam 5g is provided on the other side surface and raises a slider 15, which will be described later, in response to 50 rotations of the first cam gear.

In the above configuration, when a play operation is instructed by an operation means (not shown), the third plunger 3 is turned on and rotates the lever 4 counterclockwise against the spring 14 to move it to the position indicated by the broken line. , at this time, the protrusion 4a of the lever 4 touches the peripheral protrusion 5f of the first cam gear 5 during its movement.
The loosely curved cam gear tries to escape from being suppressed by the lever 4 by rotating clockwise in the figure, and rotates slightly clockwise. Due to this slight rotation, the toothless portion 5c moves and the end of the gear 5b engages with the flywheel gear 10, continuing to rotate clockwise until the toothless portion 5d disengages from the flywheel gear 10. When the cam gear 5 rotates and the missing teeth 5d and the flywheel gear 10 face each other, the protrusion 6a comes into contact with the end of the peripheral protrusion 7f to prevent the cam gear 5 from rotating. At this time, cam 5g
rotates from the position shown by the dashed line to the position shown by the dotted line. As shown in FIGS. 3 and 4, this rotation of the cam 5g pushes up the step 15a provided on the back side of the slider 15 from the position shown in FIG. 3 to the position shown in FIG.
8 is brought into contact with the flange 22a of the take-up reel shaft 22 and the drive pulley 19, and the tape is wound up.

The idler 18 is rotatably supported by the idler plate 16 and is configured to slide within the groove 17a of the idler slider 17. The idler slider 17 is connected to the shaft 17
At 0, it is rotatably supported on the slider 15,
The idler slider 17 is urged clockwise in the figure by the spring 35, and the idler plate 16 is always urged upward in the figure.

A protrusion 17b is formed near the upper end of the idler slider 17 toward the rear side in FIG. 3, and is configured to engage with the FC slider 9 provided on the rear side and the front side of the protrusion 17b.

The engagement relationship between the PC slider 9 and the projection 17b is as shown in FIG. 5 when the projection 17b enters the groove 9a and when the FC
There is a case where the player climbs onto the slope 9b of the slider 9, and in the play state, the PC slider 9 is in the lowered position and the slider 15 is raised, so that the shear slider 1
7 also rises, the protrusion 17b is removed from the groove 9a, and the idler slider is rotated to the right in the figure by the biasing force of the spring 35, and the idler moves to a position where it abuts against the flange 22a of the reel shaft 22. In this case, when the flange 22a and the idler 18 come into contact, as the slider 15 rises, the idler 18 and the drive pulley 19 first come into contact with each other.
Next, operations related to the head chassis will be explained. 1st
When the slider 15 is raised by the rotation of the cam gear 5, the head chassis is connected to the slider 15 by a spring 30, and the pinch roller support part 25 is connected by a spring 29, and the contact part 27 of the pinch roller support part is connected to the head chassis by the spring 30. Since it is in contact with the head chassis 28, the head chassis 28 is raised by these, the pinch roller 26 comes into contact with the capstan lla, and a play operation is started. In the braking operation, the flywheel 11 connected to the motor pulley 12 by a belt 36 rotates, the pulley 20 connected to the flywheel 11 and the belt 37 rotates, and the drive boot 9 configured coaxially with the flywheel 11 rotates.
19 and the winding shaft 22 rotates via the idler 18 in contact with the idler 18, thereby performing the winding operation. This relationship is illustrated in FIG.

Next, a case where the play state described above is paused, that is, temporarily stopped will be explained. Plunger 1 in play state
is operated by an operation means (not shown) and turned ON,
A lever 6 connected to the iron core 1a of the plunger rotates clockwise in FIG. 7 about a rotation shaft 60 against the spring 38. A protrusion 6a is provided at the tip of the lever 6, and is loosely inserted into the cam groove 7a of the second cam gear 7. Looking at the configuration of the second cam gear 7, the second cam gear 7 has an outer periphery. A gear 7b that meshes with the flywheel gear 10 is formed on the holder, and two missing teeth 7c and 7d are provided in a part of the gear 7b.

Furthermore, a center protrusion 7e and a peripheral protrusion 7f are provided on one side of the second cam gear 7, similar to the first cam gear 5.
Both constitute a cam groove 7a. Two cams 7g and 7h with different heights are provided on the other side of the trench, and the cam 7g engages with the FC slider 9 to move the FC.
It raises the slider 9, engages with the cam 7hi-1 and the abutment part 27 of the pinch roller support part 25, and pushes it downward.

When the lever 6 rotates clockwise due to the operation of the first plunger 1, the protrusion 6a presses the gentle slope 7ff of the peripheral protrusion 7f of the second cam gear 7. The VIA is rotated slightly in the direction and the VIA is missing.
7c and the flywheel gear 10 are facing each other, the end of the gear 7a is brought into a state of meshing with the flywheel gear 10, and rotation is continued until the missing tooth 7d of the second cam gear 7 and the flywheel gear 10 are facing each other. However, when the missing tooth 7d faces the flywheel gear 10, the protrusion of the lever 6 comes into contact with the end of the peripheral protrusion 7f to prevent the cam gear 7 from rotating. By the rotation of this second cam gear 7, the cam 7h
It rotates from 7hA to 7hB as shown in FIG. Due to this rotation, the pinch roller 26, which was pressed against the capstan Ila, is moved to the capstan 11. The pinch roller 26 will be separated from a.

In this case, the head chassis 28 does not move at all because the pinch roller section and the head chassis 28 are configured as separate bodies.

Due to the rotation of the second cam gear 70, the cam 7g pushes up the end 9c of the FC slider 9 at the above times. The relationship between the FC slider 9 and the protrusion 17b of the idler slider 17 is such that when the protrusion 17b is in the play state, the protrusion 17b is on the slope 9b of the FC slider 9, that is, in the position C shown in FIG. is in contact with the flange 22a of the take-up reel shaft 22, but
When the FC slider 9 rises, the vertical position of the protrusion 17b does not change, so the protrusion 17b descends completely down the slope 9b of the FC slider 9 due to the relative position, reaching the position B in FIG. 5. This means that idler slider 1
7 means that it rotates counterclockwise in FIG. 4 against the spring 35, and this counterclockwise rotation causes the idler to separate from the flange 22a and take up the winding. The rotation of the IJ-rule shaft 22 stops.

Therefore, when the first plunger 1 is turned on in the play state, the pinch roller 26
Since the magnetic heads 33 and 34 are separated from the tape and the rotation of the take-up reel 22 is also stopped, the tape running is stopped in a state where the magnetic heads 33 and 34 are not separated from the tape, and the tape is in a pause state.

To release this pause state, press the first plunger 1.
When turned OFF, the lever 6 is rotated counterclockwise by the spring 38, the peripheral protrusion 7f of the second cam gear 7 and the protrusion 6a are released, and the pressing force of the spring 39 and the weight of the IC slider 9 are released. The cam 7g of the second cam gear 7 is pressed by the pressure of the pinch roller and rotated slightly clockwise, so that the missing teeth 7C are connected to the flywheel gear 1.
Stop at the position facing 0. As a result, the F'C slider 9 descends, and the pinch roller 26
The case of returning to the play state again due to contact with la and then canceling the play state will be described. When the third plunger 3 is de-energized, the lever 4 is rotated clockwise by the spring 14, and the projection 4a (!) is disengaged from the end of the peripheral projection 5f of the first cam gear 5. The first cam gear 5 is connected to a spring 29 via a slider 15.
Since it is receiving a biasing force of 300 mm, when it is released from the projection 4a, it rotates clockwise and stops at the position shown in FIG. 2 where the missing tooth 5c and the flywheel gear 10 face each other. As a result, the head chassis 28 and slider 15 are lowered, and all operations are canceled.

Next, the fast forward (FF) operation will be explained. When the first plunger is turned on in response to a command from the operating means from a stationary state, the second cam gear 7 rotates in the same manner as in the above-described pause operation, and the F'C slider 9 is raised by the cam 7g. Here, a positioning slider 31 is pulled to the right in FIG. 7 by a spring 38 on the lever 6 driven by the first plunger 1. This positioning slider 31 is located at the front as shown in FIG.
It is constituted by a protrusion 31c that further protrudes from 1d to the rear side and engages with the FC slider 9, and the chassis 2
8 in a groove (not shown).

When the FC slider 9 rises, as shown in FIGS. 9 and 10, the positioning slider 31, which is in contact with the FC slider 9 with the protrusion 31c and is biased in the direction of the arrow Y by the spring 38, is the FC slider. 9 slope step t
! 119d in the direction of arrow Y, and the state shown in FIG. 10 is reached when the FC slider 9 is at its highest raised position.

On the other hand, an FC cam 9e consisting of a comb-like through hole is provided in the middle part of the FC slider.
A protrusion 8a provided at the tip of the FC lever 8e is loosely fitted into the protrusion 8a.

The configuration of the F'C cam 9e is as shown in FIG.
When the slider 9 is in the lowered position, the protrusion 8a is in the position A, and when the FC slider 9 is raised, it comes to the position between 1 and 2 depending on the relative relationship. When it reaches the mouth position, it rewinds (Rev), when it reaches the 7s position it is in play or pause mode, and when it reaches the second position it fast forwards (Rev).
FF) state.

In the case of fast forwarding, when the FC slider 9 starts to rise from the state shown in FIG.
1 moves in the direction of arrow Y in FIG. 9, the rising portion ata75t of the positioning slider 31 separates from the FC cam 9e. Here, the pulley 20 is pivotally supported on the F'C Reno-8, and since it is connected to the flywheel 11 by an elastic belt 37, the FC Reno-8 is always Since the FC slider is biased toward the right in FIG. 10, the protrusion of the FC cam 9e that has come off the squid moves in the second direction and enters the second recess as the FC slider rises.

In other words, this state indicates that the FC lever 8 has rotated slightly counterclockwise.
The drive gear 21 is pivotally supported on the FC lever 8 by the rotation of the
The state in which the gear meshes with the intermediate gear 24 is shown in FIG. 12. The drive gear 21 receiving driving force from the boot 920 through the shaft rotates the gear 22b of the winding reel shaft at high speed through the intermediate gear 24. Then, a fast forward 9 operation is performed. To cancel this fast forward υ state, turn off the first lunger 1 in the same way as when canceling the pause state.
The C slider 9 descends, and the protrusion 8a of the FC lever 8 moves to the F position.
Return to position A along the upper slope of the C cam 9e.

Next, the rewinding T(,ew) operation will be explained.

The point of energizing the plunger l of gi and raising the FC slider 9 is the same as in the case of fast forwarding, but by energizing the second plunger 2 at the same time as the first plunger 1 or with a slight delay. , which biases the FC lever 8 connected to the iron core 2a of the second plunger 2 in the clockwise direction in the figure.
When the C slider 9 rises, the protrusion 8a released from A of the FC cam 9e enters the mouth.

In this state, the drive gear 21 which is pivotally supported by the lever 8
This indicates that the drive gear 21 is engaged with the gear 23 of the supply reel shaft 13 as shown in FIG. 13, and the pulley 2o is moved to the left in FIG. The transmitted rotational force is transmitted to the supply reel shaft 13, and rewinding is performed at high speed.

In this case, the energization to the second plunger 2 is at most FC
It is sufficient if the slider 9 is of a temporary type that rises.

Next, the relationship between the FC slider 9, the FC lever 8, etc. in the above-described pose will be described.

Operate the first plunger 1 from the play state to F'C
The slider 9 is raised, but in this case as well, the tip of the front part 31b located at the front is connected to the protruding part 2 of the head shear 728.
Since the position is set so as to contact the FC slider 8a, even if the FC slider 9 rises and the positioning arm attempts to move in the direction of the arrow Y, it cannot move. At this time, positioning arm 3
Since the rear rising portion 31d of the FC lever 8 is set to be located to the right of A and C of the FC cam 9e, the protrusion 8a of the FC lever 8 rises 31d without changing its position in the left-right direction.
Guided by, we enter Ha. Therefore, the drive pulley 19 and the drive gear 21, which are pivotally supported by the FC lever 8, do not change their positions from the play state, and as described above, the idler J
By slightly changing the position of only 8, the take-up reel shaft 2
This will cut off the rotational transmission to 2.

Next, key operations will be explained. first plunger 1
O, Nl, As described above, the FC slider 9 rises, and the positioning slider 31 reaches the most advanced position in the Y direction by the spring 38, as shown in FIG.

When the third plunger 3 is turned on with a slight delay from the first plunger 1, the head shear 728 is raised in the same manner as the play operation described above. However, at this time, the positioning slider 31 has already moved farthest in the Y direction, so
As shown in FIG. 15, the protrusion 28 of the head chassis 28
a comes into contact with the lower part of the front portion 31b of the positioning slider 31, and the bed chassis 28 is prevented from rising.

Even if the head chassis 28 is prevented from rising, the cam 5g of the first cam gear 5 is moved to the slider 1 in the same way as in the play operation.
However, since the slider 15 and head chassis 28 are connected by a spring 30, even if the head chassis 28 is prevented from rising by the positioning slider 31, the first cam gear 50 rotations will not occur. There is no sign of me.

In this key operating state, the head chassis 28 is located slightly below the fly state, and the tape is in the operating state.

The head slightly touches the tape. At this time, the pinch roller 26 is in the eighth position because the second cam gear 7 is in the operating position.
It is located at the position indicated by the dotted line in the figure, and is not crimped with the capstan lla. - When the FC slider 9 is in the raised position and the state is similar to fast forwarding, the above-mentioned through 9 winding reel shaft 22 is rotated at high speed, and the key is sent at high speed while detecting signals from the tape. An action will be taken.

In addition, for the so-called review operation in which signals are detected from the tape and sent to the supply reel at high speed, the second plunger 2 is turned on after or at the same time as the first plunger if, oNl in the case of the cue operation described above. Especially,
A review operation can be performed by creating the same state as the above-mentioned rewind and turning on the third plunger 3 at the same timing as the cue operation.

Next, the operation in which the head chassis 28 returns H1 from the forward position to the rest position, such as during a play operation, will be described.

FIG. 16(a) shows the vent chassis 28 and the slider 15.
Figure 1 shows the relationship between the pinch roller support section 25 and the pinch roller support section 25. The slider 15 and the pinch roller support part 25 are connected by a spring 29, and the head chassis 28 and the pinch roller support part 25 are connected to each other by a contact part 27a provided on the pinch roller support part 25.
contact with. The relationship between the head chassis 28 and the contact portion 27 when the head chassis 28 is lowered is as shown by dotted lines and dashed lines in FIG. 16(a).

Note that when the slider 15 and the helad chassis 28 start descending, they come into contact at 15b and 28b, respectively, and descend as one. In this case, the rotation shaft 250 of the pinch roller support part 25 is set as a point A, the connection point between the spring 29 and the pinch roller support part 25 is set as A, the contact point between the head chassis 28 and the contact part is set as a point A, and the contact point between the slider 15 and the spring is set as a point A. If you use the 29 connection points as a construction and connect each part with a line, you can draw a diagram like Figure 16(b).

When the upward pressure on the slider 15 by the first cam gear 5 is released in the position where the head chassis 28 is raised, the contraction force of the spring 26 makes it possible to consider that the dowel and the dowel are substantially integrated. It attempts to balance the contraction force of the spring 26 by applying it to a point. When this force 2 is decomposed, it becomes Za and ZbK, but the dot is Herad chassis 28
This is the contact point between the contact part 27 of the pinch roller support part 25, and although it can move in the X-axis direction, it cannot move in the Y-axis direction, so of the component force of Z, Za is Completely killed. However, since there is a remaining component force in the zb force direction, the head chassis 28 moves in the zb force direction, and a lowering operation of the head chassis is performed.

As detailed above, in the present invention, all operations including the key and lever are performed by a gear coaxial with the flywheel, so the plunger used to start each operation is of small capacity. Moreover, since the operating system is divided into two cam gears and operated, the response is faster and more reliable than when operating with a single cam gear.

In addition, in the present invention, one E"C slider and one F'
The rotation transmission state to the supply and take-up reels is set by the combination of the C lever.In the case of early spring retrieval, the tension of the drive belt is used, and in the case of rewinding, the second plunger is used. Since it only needs to be operated for a short time, power consumption is low and economical, and the operating state can be switched reliably with a relatively simple configuration.Furthermore, the contact relationship between the positioning slider and the head chassis is By setting the positioning slider to work both when preventing the movement of the pose etc. of the positioning slider and when preventing the movement of the spare chassis such as keys or levies, it is possible to play and fast forward with a small number of parts. In addition to normal operations such as , rewind, pause, etc., key and levy operations can be performed.

[Brief explanation of drawings]

The first page is all related to the present invention, and FIG. 1 is a front view showing the entire arrangement. Figure 2 shows the first part of Figure 1.
FIG. 3 is a front view showing only the cam gear portion of the vehicle. 3 and 4 are front views schematically showing the operating state of the idler portion of FIG. 1. FIG. FIG. 5 is a schematic front view of a portion of the FC slider. FIG. 6 is a schematic front view showing the rotation transmission relationship in the play state. , FIG. 7 is a front view showing only the second cam gear portion. , FIG. 8 is a front view showing only the pinch roller portion. Figure 9, Figure 410, Figure 14, Figure 15
Each figure is a schematic front view showing the relationship between the FC slider and the positioning slider. FIG. 11 is a schematic diagram showing only the FC cam portion of the FC slider. FIGS. 12 and 13 are schematic front views showing the rotational transmission relationship in fast-forward and rewind states, respectively. FIG. 16(a) is a front view for explaining the lowering operation of the Herad chassis, and FIG. 16(b) is a schematic diagram for explaining the same. DESCRIPTION OF SYMBOLS 1...First plunger, 2...Second plunger, 3...Third plunger, 4-...Lever, 5...-
・First cam gear, 6... Lever, 7... Second cam gear, 8... FC lever, 9... FC slider, 10... Flywheel gear, 11... Flywheel, lla... Capstan, 12... Motor pulley, 13... Supply reel shaft, 15... Slider, 16... Idler plate, 17... Idler slider, 18... Idler, 19. ... Drive pulley, 20... Pulley, 21... Drive gear, 22.
... Winding lj-le shaft, 24... Intermediate gear, 25.
...Pinch roller support part, 26...Pinch roller, 2
8...Head chassis, 14.29.30.35.3
8.39... Spring, 31... Positioning slider, 36.37... Belt Patent Applicant Trio Co., Ltd. Figure 2 Figure 3 Figure 4 Figure 11 Figure 0 Figure 6 4 Former Figure 8 Figure 9 Figure 10 Figure 12 Figure 13 Figure 4 Figure 14 Figure 15 Figure 16 (0)

Claims (1)

[Claims] a cam gear driven by a flywheel gear formed coaxially with the flywheel and having a cam on the side;
A slider that is slid by the cam gear and has a cam portion on a part thereof, and a rocker that has a protrusion at one end that engages with the cam portion of the slider, and a pulley to which rotational force from the driving means is transmitted is pivotally supported. The lever has a freely movable lever, and the rotation of the pulley is transmitted to a predetermined rotation means by selectively setting the engagement position between the cam part and the protrusion of the lever when the slider slides. A drive device for a cassette tape recorder characterized by the following.